Screw jack for structures for easily adjusting its angle

Abstract

A structural screw jack capable of easily accommodating adjustment of its angle of inclination. The screw jack can allow the orientation of a chute located at one end of the screw jack is be adjusted to define either a right angle to the longitudinal axis of the jack, or over a range of oblique angles relative to its longitudinal axis so that the screw jack may be installed at an oblique angle between earlier installed vertical and horizontal oriented structural steel shapes, and thereby enabling a reduction in the number of process steps customarily used during field installation of diagonal braces supported by a screw jack. The screw jack includes a lower coupling shaft, a lower jack, and a steel bar. The upper jack includes an upper coupling pipe having a plurality of reinforcing ribs formed on the outer side surface thereof, and an upper holder closely coupled to the outer side surface of the upper coupling. One end of the lower coupling shaft is integrated at its one end to the lower portion of the upper coupling pipe. The other end of the lower coupling shaft having a predetermined curvature forming a rack thereon and has a through hole formed in the cross direction of the lower coupling shaft. The lower jack includes a chute in which pinions are formed to be meshed with the rack, and coupling holes located at both sides of the chute member are formed. A lower holder which is closely coupled to the outer surface of the chute.

Description

CLAIM OF PRIORITY [0001] This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C.§119 from an application for SCREW JACK FOR STRUCTURES FOR EASILY ADJUSTING ITS ANGLE earlier filed in the Korean Intellectual Property Office on the 28 Jul. 2004, and there duly assigned Serial No. KR2004-59171. BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a screw jack capable of easily adjusting its angle of inclination relative to a structure being supported, and, more particularly, to a screw jack for structures which is capable of easily adjusting a chute member located at one end of the screw jack, to enable the screw jack to be readily and accurately adjustably installed obliquely against vertical and horizontal steel structural shapes. [0003] 2. Description of the Related Art [0004] Generally, screw jacks such as have been disclosed in Korean Utility Model Application No. 20-1999-3277, fil...

AI Technical Summary

Benefits of technology

[0006] Therefore, the present invention has made in view of the above problems, and it is an object of the present invention to provide a screw jack for structures which is capable of adjusting a chute member located at one end of the screw jack such that angles of the screw jack to be installed to vertical and horizontal shape steels can be easily adjusted, of reducing the number of working processes, such as attaching holding shape steels to a vertical and a horizontal shape steels, and cutting holding shape steels, thereby enhancing working efficiency, and of minimizing waste of the holding shape steels.

[0008] It is still another object to provide a screw jack and process that readily enables oblique positioning of structural members during field erection, at angular orientations that accurately conform to earlier erected structural members.

Problems solved by technology

Consequently, the angle of inclination is fixed, which, in turn, limits the usefulness of the screw jack to provide bracing, or other angular support to excavated earthen or structural steel shapes, at anything other than a predetermined angle.

Depending on conditions at the construction site however, this is a difficult task to perform quickly and accurately; usually one or more filling members, or shims, must be cut and then carefully inserted between the strut supported by the screw jack and the earthworks or structural steel shape braced by the strut.

This is a tedious, time consuming and unwelcome task which must be performed on the job site for each strut.

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